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two keypad IC's under the keypad and next to the keypad connector
unfortunately all the keypad points are linked to the IC's and so even
if one key doesn't work it is related to these IC"s in question UNLESS
the keypad connector is dirty or sticky please do service your phone or
take it to a reliable technician

i think the moisture has entered into the keypad sensor where it must have shorted the leads on the keypad board...you should remove the keypad layer and make it dry thoroughly..i would advise to take it to the service center for curing the keypad asap....if the phone is under warranty you can take it to the customer care